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ToughMet® Nickel Bronze 729 / C729 / C72900

Copper Nickel C72900 Toughmet Copper Nickel Tin

ASTM B249, ASTM B740, ASTM B929, AMS-4596B,UNS C72900

Level 4
Level 3
Oxyacetylene Welding

Farmers Copper Ltd. maintains an extensive inventory of Materion spinodal alloy ToughMet 3 Copper Nickel Tin C729. Copper alloy 729 is an excellent alternative to nickel alloys, aluminum bronzes, and beryllium copper. C729 ToughMet alloys are anti-galling, free of lead and beryllium, and show excellent corrosion and stress corrosion cracking resistance in seawater applications. ToughMet (C72900) has exceptional high strength, excellent machinability, and is non-magnetic.

Farmers Copper has the following specs for C729 copper nickel in stock:

  • ASTM B249
  • ASTM B740
  • ASTM B929
  • AMS-4596B
  • UNS C72900

C72900 Toughmet Copper Nickel Tin Shapes

C72900 Toughmet Nickel Bronze Sizing

Round Bar (3/8” dia to 9-1/4”)

Hollow Bar (Upon Request)

Sheet (Upon Request)

C72900 Toughmet Copper Nickel Tin Applications

  • Drilling and mining equipment
  • Aircraft bearings and bushings
  • Pump parts
  • Thrust washers
  • Electrical
  • Industrial
  • Marine


Farmer’s Copper Ltd. extends its services throughout many industries. We provide the raw copper alloy materials in various standard shapes as well as custom cut copper alloys.

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Our C72900 Toughmet Copper Nickel Tin Inventory & Properties

Farmer’s diverse inventory of products and services offered provides our customers the largest and most extensive selection of alloys available, cut to precise specifications, and delivered with total quality control.

Chemical Properties

ElementCu (1,2)Pb(3)SnZnFeNi(4)Mg MnNb
Min %7.5 14.5
Max (%)Rem 0.30 0.10
(1) Cu + Sum of Named Elements 99.7% min. (2) Cu value includes Ag. (3) 0.005% Pb max. for hot rolling. (4) Ni value includes Co.

Physical Properties

Melting Point - Liquidus°F2039
Melting Point - Solidus°F 1742
Densitylb/cu in. at 68°F 0.323
Specific Gravity8.94
Electrical Conductivity% IACS at 68°F7.8(1)
Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F17
Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F)9.1
Specific Heat CapacityBtu/ lb /°F at 68°F0.09
Modulus of Elasticity in Tensionksi18500
Modulus of Rigidityksi 7500
(1) Aged condition

Fabrication Properties

AlloyJoining TechniqueSuitability Level
Oxyacetylene WeldingGood
Gas Shielded Arc WeldingExcellent
Coated Metal Arc WeldingExcellent
Spot WeldExcellent
Seam WeldExcellent
Butt WeldExcellent
Capacity for Being Cold WorkedExcellent
Capacity for Being Hot FormedExcellent
Capacity for Being Cold WorkedExcellent
Capacity for Being Hot FormedGood

Mechanical Properties

FormTemperTemper CodeTensile Strength (ksi)YS-0.2% OffsetYS-0.5% Ext(ksi)YS-0.05% OffsetElongation (%)
1/2 Hard and Spinodal Hardened (1/2 TS)TS02145 Min for Standard125 Min for Standard 33 Typ
1/4 Hard and Spinodal Hardened (1/4 TS)TS01 130 Min for Standard105 Min for Standard4 Typ
3/4 Hard and Spinodal Hardened (3/4 TS)TS03155 Min for Standard135 Min for Standard2 Typ
Hard and Spinodal HardenedTS04165 Min for Standard145 Min for Standard2 Typ
Mill-hardened Temper, TM - 1/2 HardTM02105 Min for Standard90 Min for Standard 80 Min for Standard15 Typ
TM0095 Min for Standard75 Min for Standard70 Min for Standard22 Typ
Mill-hardened Temper, TM - HardTM04115 Min for Standard105 Min for Standard95 Min for Standard10 Typ
Mill-hardened Temper, TM - XHMS SpringTM08150 Min for Standard140 Min for Standard125 Min for Standard2 Typ
Mill-hardened Temper, TM -XHM - Extra HardTM06 130 Min for Standard120 Min for Standard105 Min for Standard6 Typ
Solution Heat TreatedTB0064 Min for Standard24 Min for Standard32 Typ
Solution Heat Treated and Cold Worked: 1/2 HardTD0285 Min for Standard65 Min for Standard8 Typ
Solution Heat Treated and Cold Worked: 1/4 HardTD01 75 Min for Standard50 Min for Standard18 Typ
Solution Heat Treated and Cold Worked: 3/4 HardTD0395 Min for Standard80 Min for Standard3 Typ
Solution Heat Treated and Cold Worked: HardTD04 100 Min for Standard85 Min for Standard
Spinodal Hardened-Low Strength (ATLS)TX00120 Min for Standard95 Min for Standard6 Typ
* Measured at room temperature, 68°F (20°C).

Our Commitment to Service

As a leading copper, brass, & bronze alloys supplier, Farmers Copper Ltd. attributes our success to serving our customers, through our service-minded employees and material readily available for prompt, accurate deliveries of copper, brass, bronze, stainless steel and other metal alloys.

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